Technitium DNS Server is build to be cross platform using the .NET Standard 2.0. You can run the DNS Server Portable App on Linux or macOS by using .NET Core 2.2. This post is written for Ubuntu Linux but, you can easily follow similar steps on your favorite distro.
This blog post is updated regularly to provide latest instructions to install the DNS Server. So, refer it when you are about to do a fresh installation.
Using Automated Installer
Automated installer script can be used to install or update the DNS Server. Automated installer script is available for following distros:
- Ubuntu Server
curl -sSL https://technitium.com/download/dns/install-ubuntu.sh | sudo bash
- Raspbian (Stretch) for Raspberry Pi
curl -sSL https://technitium.com/download/dns/install-raspi.sh | sudo bash
Installing DNS Server Manually
Install the latest .NET Core runtime from here. Start Terminal and follow the steps below to run DNS Server on Ubuntu:
- Download DNS Server portable app using wget and extract it.
wget https://technitium.com/download/dns/DnsServerPortable.tar.gz sudo mkdir -p /etc/dns/ sudo tar -zxf DnsServerPortable.tar.gz -C /etc/dns/
You can now run the DNS Server directly from console as a standalone app.
cd /etc/dns/ sudo ./start.sh
- Or, if your distro uses systemd, follow these steps to install it as a daemon.
sudo cp /etc/dns/systemd.service /etc/systemd/system/dns.service sudo systemctl enable dns.service sudo systemctl start dns.service
You may want to check the systemd log entries to find issue if the daemon fails to start:
journalctl --unit dns --follow
- Or, if your distro does not support systemd, follow these steps to run it as a daemon using supervisor.
sudo apt-get -y install supervisor sudo cp /etc/dns/supervisor.conf /etc/supervisor/conf.d/dns.conf sudo service supervisor restart
You may want to check the log file to find issue if the daemon fails to start:
- Open the url http://localhost:5380/ to access the web console.
Common Issue With Ubuntu
If you are using Ubuntu Desktop, you may find dnsmasq or systemd-resolved daemon already running on UDP port 53 preventing the DNS Server to listen on the same port. You can check the DNS Server log file from the web console to confirm the issue by finding this error:
[2019-01-01 07:30:59 UTC] [0.0.0.0:53] System.Net.Sockets.SocketException (98): Address already in use at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, String callerName) at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.Bind(EndPoint localEP) at DnsServerCore.DnsServer.Start() in Z:\Technitium\Projects\DnsServer\DnsServerCore\DnsServer.cs:line 811
You may confirm if its dnsmasq or systemd-resolved by running sudo netstat -nlpu command.
Follow these steps below to disable the dnsmasq service:
- Edit the NetworkManager.conf file to disable dnsmasq service:
sudo nano /etc/NetworkManager/NetworkManager.confComment out the dns=dnsmasq line by adding # character at the beginning like this #dns=dnsmasq and exit the editor by pressing CTRL+X and enter y to save the file.
Restart the computer to apply changes as shown below:
sudo reboot now
- After system reboot, open Terminal and check DNS Server logs again from the web console.
Follow these steps below to disable the systemd-resolved service:
- Disable the systemd-resolved service and stop it:
sudo systemctl disable systemd-resolved sudo systemctl stop systemd-resolved
Edit your /etc/resolv.conf using nano:
sudo nano /etc/resolv.confEdit the existing nameserver entry to the one shown below in your /etc/resolv.conf
Edit your /etc/NetworkManager/NetworkManager.conf using nano:
sudo nano /etc/NetworkManager/NetworkManager.confPut the following line in the [main] section of your /etc/NetworkManager/NetworkManager.conf as shown below:
sudo service network-manager restart
- Now restart the DNS Server and check logs again from the web console.
sudo systemctl restart dns.service
The DNS Server is running and you can configure your network with the IP address of this computer for DNS resolution.
Check out the web console to create zone, check cached zones, access DNS client tool and configure server settings.
The DNS Server creates a folder named config in the current folder which contains the server config and zone files. Make sure you copy this folder while moving the DNS server folder if you want all the zone files and config to persist.
For any related queries, feel free to comment on this post.